|Publication number||US6755870 B1|
|Application number||US 09/622,754|
|Publication date||Jun 29, 2004|
|Filing date||Dec 22, 1999|
|Priority date||Dec 24, 1998|
|Also published as||DE19859931A1, EP1058524A1, EP1058524B1, WO2000038599A1|
|Publication number||09622754, 622754, PCT/1999/10280, PCT/EP/1999/010280, PCT/EP/1999/10280, PCT/EP/99/010280, PCT/EP/99/10280, PCT/EP1999/010280, PCT/EP1999/10280, PCT/EP1999010280, PCT/EP199910280, PCT/EP99/010280, PCT/EP99/10280, PCT/EP99010280, PCT/EP9910280, US 6755870 B1, US 6755870B1, US-B1-6755870, US6755870 B1, US6755870B1|
|Inventors||Lutz Biedermann, Wilfried Matthis, Christian Schulz|
|Original Assignee||Biedermann Motech Gmbh|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (12), Non-Patent Citations (3), Referenced by (123), Classifications (22), Legal Events (6)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The invention relates to a leg prosthesis with an artificial knee joint according to the preamble of claim 1 and a method for controlling a leg prosthesis according to the preamble of claim 14.
When walking with a prosthesis, the prosthesis upper leg is moved by the leg stump in a forward direction during the walking. If the damping is not adapted, due to its inertia, the lower leg may be angled to a very large extent. The person wearing the prosthesis then has to wait until the prosthesis has moved back to its forward position before being able to place its foot on the ground. This results in unharmonic gait appearance, inappropriate timing performance and thus poor or less than optimal support properties.
There are known leg prostheses with an artificial knee joint where a damping element in the form of a pneumatic or hydraulic cylinder is provided for swing phase control and as a so-called fall back brake. The adaptation of the leg prosthesis to the person carrying it is achieved using a stationary gait analysis system. To this end, the person wearing the prosthesis has to perform a test walk with the prosthesis, e.g. on a running machine, with an orthopedic technician then providing a subjective judgement of the gait appearance. Together with the subjective feelings of the person wearing the prosthesis, the various components of the prosthesis are then adapted and set. Very often, the result of the setting is inaccurate, since the setting is carried out using subjective criteria. In addition, supplementary modifications such as weight, temperatures or the nature of the ground are not taken into consideration.
Further, the known damping elements for artificial knee joints have the drawback of not being able to respond fast enough to an abrupt change of the gait dynamics.
GB 1,191,633 discloses a leg prosthesis having an artificial knee joint with a hydraulically controlled brake, where a ferro-colloidal liquid or another magnetic liquid are used as the hydraulic liquid.
DE 195 21 464 A1 discloses a leg prosthesis having an artificial knee joint according to the preamble of claim 1 and a method for controlling such prosthesis according to the preamble of claim 14. In this leg prosthesis, when the type of gait is changed, the control of the knee brake can also be changed using a respective adaptation of a stored reference pattern. To various types of gait such as walking on flat ground or climbing stairs is associated a special control program, respectively, for controlling the knee brake. During the walking, the type of gait is determined by measuring the hip joint muscular activity and comparing the measured values with stored reference values, and the knee brake is controlled with the control program associated to this type of gait. The reference values for a type of gait are determined beforehand for each person wearing the prosthesis. However, there is no change of a control program associated to a specific type of gait.
In the known leg prosthesis, however, there is the problem that an adaptation of the prosthesis control, i.e. of the control programs, to changing circumstances with respect to the person wearing the prosthesis, such as gain or loss of weight of the person wearing the prosthesis or wearing different shoes, or with respect to the surroundings such as walking on flat ground on a bumpy path, is not carried out.
It is an object of the invention to provide a leg prosthesis having an artificial knee joint and a method for controlling such prosthesis, guaranteeing an optimum operation of the prosthesis and adapted to the person wearing it irrespective of changing operational circumstances as well as a fast reaction to abrupt changes in gait dynamics.
This object is achieved by a leg prosthesis according to claim 1 and by a method according to claim 14 for controlling such prosthesis. Further embodiments of the invention are presented in the dependent claims.
Additional features and purposes of the invention will be understood from the description of embodiments with reference to the figures where:
FIG. 1 is a schematic representation of a first embodiment of a leg prosthesis having an artificial knee joint with swing phase control and a fall back brake;
FIG. 2(a) is a lateral view of a leg prosthesis in a second embodiment;
FIG. 2(b) is a front view of the leg prosthesis of FIG. 2(a);
FIG. 3(a) is a lateral view of a third embodiment of a leg prosthesis;
FIG. 3(b) is a front view of the leg prosthesis of FIG. 3(a);
FIG. 4 is a schematic representation of a control and adjustment device for the leg prosthesis according to the invention;
FIG. 5 is a diagram for illustrating the operation of the control and the adjustment for the leg prosthesis according to the invention; and
FIG. 6 is a curve representing the knee angle as a function of time for a step.
Referring in particular to FIG. 1, the leg prosthesis comprises a thigh portion 1 and a lower leg portion 2 as well as a knee joint 3 connecting the two portions. The lower leg portion 2 comprises a shin-bone part 4 having a lower leg tube 9 and a foot part 5 connected therewith. The foot part 5 comprises a leaf spring in a known fashion, not shown in the figure, permitting resilient stepping on the ground. The thigh portion 1 is designed to be connected to the leg stump.
The knee joint 3 comprises a damping element in the form of a hydraulic piston-cylinder means 6. The cylinder 7 of the piston-cylinder means 6 is connected to the shin-bone part 4 and the piston rod 8 of the piston-cylinder means 6 is connected to the knee joint 3. Preferably, the cylinder 7 is an MRF-cylinder. This cylinder is filled with a magneto-rheological liquid (MR-liquid) having the property of changing its viscosity within a range of 3 to 5 milliseconds under the influence of a magnetic field. The magneto-rheological liquid consists of a suspension of magnetizable particles in the micrometer range in an oil.
The piston 8 or the cylinder 7 of the piston-cylinder means 6 further comprises a solenoid which can be controlled by an external signal and which provides the magnetic field for acting on the magneto-rheological liquid.
The leg prosthesis further comprises a number of sensors for measuring motion and force. In the knee joint 3, there is provided a knee angle sensor S1 for detecting the knee angle. At the shin-bone part 4, acceleration detectors are optionally provided. A frontally arranged acceleration sensor S2 is supposed to measure the acceleration in the direction of propagation, a laterally arranged acceleration sensor S3 is supposed to measure the acceleration perpendicular to the direction of propagation. As these acceleration sensors, regular acceleration sensors such as those known from automotive technology, may be used.
For measuring the force acting on the prosthesis, one or more force sensors are provided. According to the embodiment shown in FIG. 1, force sensors S4 to S7 are provided in the region of the sole of the foot. The force sensor S4 is arranged in the toe region, the force sensors S5 and S6 are arranged in the bale region, and a force sensor S7 is arranged in the heel region. As these sensors, regular force sensors such as those based on a compression spring, may be used. The force sensors provide information for the introduced force and permit to distinguish between standing phase and swing phase.
FIGS. 2(a) and 2(b) show a preferred embodiment of the leg prosthesis where force sensors S8 and S8′ are provided at the lower leg tube 9. For example, the force sensors are strain gauge sensors. In the operating position of the leg prosthesis, the force sensor S8 is provided laterally either inside or outside and detects the total force acting on the prosthesis. In the operating position of the leg prosthesis, the force sensor S8′ is provided at the front or at the rear side and detects the bending occurring at the lower leg tube.
In FIGS. 3(a) and 3(b), a further preferred embodiment of the leg prosthesis is shown where, as an alternative to the previously described embodiment, force sensors S9 and S9′ are integrated in the shin-bone part 4 for measuring the total force and the lateral (bending) force, respectively. Preferably, the force sensors S9, S9′ are formed as strain gauge type sensors embedded into the carbon fiber support material of the shin-bone part 4. The arrangement of the sensors S9 and S9′ in the operation position of the leg prosthesis is such that the sensor S9 is provided laterally either at the inside or at the outside and the sensor S9′ at the rear side or the front side, i.e. analagous to the embodiment according to FIGS. 2(a) and 2(b).
Compared to the arrangement of force sensors in the foot part 5, the arrangement of the force sensors in the lower leg tube 9 or in the shin-bone part 4 has the advantage that different foot parts may be used, if required, and that no inconvenient wires for transferring data to the foot part to the control unit of the prosthesis are present.
The signal outputs of sensors S1 to S7 and of S1 and S8, 8′ or S9, 9′ are connected to one or more inputs E of a control and adjustment unit 10. Preferably, the control and adjustment unit 10 is integrated in the shin-bone part 4, as described in FIGS. 2(b) and 3(b). In addition, a battery 11 is integrated in the shin-bone part 4 or in the lower leg tube 9, providing power to the control and adjustment unit 10. The control unit comprises a CPU and a data memory. In the data memory, a program having an algorithm for processing the incoming signals from the sensors and for generating one or more output signals is provided. A signal output A of the control unit 10 is connected to the piston-cylinder means 6 and in particular to the solenoid provided in the piston.
The configuration of the control and adjustment unit 10 can be seen from FIG. 4 and will be described in more detail. The components for processing the signals generated by the sensors are arranged on a circuit board 20. The circuit board 20 comprises an interface 21 where the signals detected by the sensors are applied in accordance with the knee angle, the total force or the ground reaction force and the bending force. In a further embodiment, the signals of the acceleration sensors can also be entered. The interface 21 is formed such that preprocessing such as amplification of the signals occurs and a knee angular velocity is calculated. In addition, an electronic circuit 22 is provided on the circuit board 20, which circuit comprises a micro-controller 23 having a program memory, a working and parameter memory 24, a power supply 25, an analog-to-digital converter 26 and an interface 27 as the interface for the piston-cylinder means 6. Optionally, a real time clock 28 and an SIO-interface 29 are provided. There are provided corresponding connecting lines between the individual components of the circuit. The signals “knee angle, knee angular velocity, total force and bending force” preprocessed in the interface 21 are fed into the analog-to-digital converter 26 and the generated digital signals are fed into the micro-controller 23. In the micro-controller 23, an algorithm for predetermined processing of the signals is stored. The signals output from the micro-controller are applied to the interface 27 and output for controlling the piston-cylinder means.
In the working and parameter memory 24 and the program memory of the micro-controller 23, the following data are stored:
a) A knee angle reference curve represented in FIG. 6 and illustrating the knee angle as a function of time for the time of one step. The knee angle reference curve is composed of the standing phase which is the time comprising putting the heel on the ground via rolling the foot around the bale until the beginning of the flexion of the knee joint, and a swing phase which comprises the flexion and the extension of the knee joint until again placing the heel on the ground. The knee angle reference curve shows optimum step performance where the values for the knee angle have been empirically determined. The knee angle reference curve is the same for every person wearing the prosthesis. Preferably, the knee angle reference curve is stored in normalized form such as a step time of 1 second.
For each type of gait such as walking on an incline which contains walking horizontally as a special case, or for climbing stairs, such knee angle reference curve identical for whoever wears the prosthesis is stored.
b) An allocation of knee angle maxima for different gait velocities. Discrete values of the knee angle maximum with respect to an empirical gait velocity have been determined empirically beforehand for each person wearing the prosthesis or are simply given without knowing the person currently wearing the prosthesis. Intermediate values can be obtained by interpolation.
c) Control parameters P for controlling the piston-cylinder means for different gait velocities, respectively. The control parameters comprise an extension damping gain factor Ed which is a measure of the damping gain for the extension, and a flexion damping gain factor Fd which is a measure of the damping gain for the flexion. These control parameters P have been determined empirically beforehand for each person wearing the prosthesis for different gait velocities and using a gait analysis, or are simply given as starting values for controlling the piston-cylinder means without having been adapted already to a specific person wearing the prosthesis.
The predetermined algorithm stored in the micro-controller 23 for storing and adjusting the piston-cylinder means will be described with reference to FIG. 5. The algorithm constitutes the method according to the invention for controlling and adjusting the control unit of the leg prosthesis.
Based on the digital signals output from the analog-to-digital converter 26 for the knee angle, the knee angular velocity, the total force and the bending force, the following step values are determined in step (1):
the maximum flexion angle corresponding to the maximum knee angle for this step;
the stretch lead time which is the time between the extension stop and the placing of the heel on the ground;
the standing time; and
the step time.
Based on these step values, the maximum flexion angle and the stretch lead time are determined as actual step values.
At the same time, the presumed step velocity is determined in step (1). For example, this is done by combining an initiation time which is the time starting from the introduction of the force and the first change in knee angle until complete lift-off from the ground, and the introduction knee angle. As an alternative, the step velocity is determined by determining the knee angle velocity at a predetermined flexion angle, preferably at about 20°, at which angle the foot is lifted off completely from the ground.
In step (2), the actual step values are compared to the set step values. The set step values are step values empirically determined by gait analysis for optimum prosthesis setting to achieve natural gait performance and are identical for every person wearing the prosthesis. In particular, the set step values are as follows:
The knee angle maximum is preferably between 55° and 60°. The stretch lead time is preferably in the range of 0.06 to 0.1 seconds.
The set step values for a particular type of gait correspond to the step values determined from the knee angle reference curve for this type or gait. Thus, the set step values include a basic shape and a course of time, but not the absolute values.
In step (3), a combination of the differences between set step values and actual step values is performed for the determined step velocity in a predetermined fashion in order to determine correction factors for the control parameters P:
a) If the maximum actual flexion angle is in the range of the set knee angle, a correction is not required. If the maximum actual flexion angle is greater or less than the set knee angle, the flexion damping gain factor Fd has to be increased and decreased, respectively.
b) If the actual stretch lead time is in the range of the set stretch lead time, a correction is not required. If the actual stretch lead time is greater or less than the set stretch lead time, the extension damping gain factor Ed has to be increased and decreased, respectively.
c) If the rest time is greater than 2 seconds, the step is not to be included in the readjustment of the control parameters, since it characterizes starting or stopping when walking.
The extent of the increase or decrease of the correction factors can be constant in modulus, i.e. independent of the amount of difference between the actual step values and the set step values, or it may depend on the difference between the actual step values and the set step values.
In step (4), the control parameters P are selected for controlling the piston-cylinder means as a function of the presumed step velocity and of the corresponding value for the knee angle maximum stored in the working and program memory 24. In accordance with the result from step (3), the control parameters P are combined with correction factors and thus, are readjusted vis-a-vis the empirically determined original control parameters P stored in the memory for the corresponding velocity. The corrected actual control parameters P′ thus obtained are again stored in the memory as values now valid and will be used as a starting point in the subsequent step for readjustment.
The part of the algorithm performing the actual level control of the piston-cylinder means operates as described below:
The actual control parameters P′ are used for controlling flexion and extension, respectively, i.e. they effect a defined setting of the damping or brake value of the piston-cylinder means between a basic damping an a maximum damping. The control of the piston-cylinder means is firmly given for the knee angle reference curve. In order to determine when the calculated and corrected control parameters P′ are supposed to become effective, the knee angle reference curve is scaled to the presumed step velocity. When controlling flexion, the maximum flexion angle and the flexion time are adapted, and when controlling extension, an adaptation to the obtained maximum flexion angle and the required flexion time is effected. Flexion control is only performed in the time interval between stopping and reaching the maximum knee angle. A difference is established between the actual knee angle velocity and the required velocity in order to reach the next knee angle position in the time interval. If the actual knee angle velocity is too large, damping has to be performed. In the case of flexion, the damping is equal to the difference in velocity times the flexion damping gain factor. In the case of extension, damping is equal to the difference in velocity times the extension damping gain factor. If the actual velocity is too small, damping is not performed.
As can be seen from FIG. 5, the partial step of step (1) in which the presumed step velocity is determined, and step (4) with the subsequent control of the piston-cylinder means constitute the control plane. The partial step (1) in which the step values are determined, together with steps (2) and (3) constitutes the adjustment plane.
The control and adjustment through the algorithm also contains a standing phase consolidation. To this end, the signals “total force” and “bending force” are used. If, in the stepping-on-the-ground interval, the total force increases and the bending is in the heel region or the knee angle increases and the total force acts on the foot while the bending force is not in the front foot region, the brake will be activated by 100%, i.e. no further flexion can be performed. However, if the bending force is in the front foot region, the brake will not be activated.
The control of special situations comprises the controls “climbing stairs”, “stumbling” and “falling down”. Walking on an incline is treated like extension or flexion. For the special situation “climbing stairs”, there are separate empirical values, i.e. a special knee angle reference curve. For the special situations “stumbling” and “falling down” or “hitting”, the standing phase consolidation is activated.
In operation, the control of the leg prosthesis works as follows. The measuring data of the knee angle and force sensors are fed to the control unit 10. The control unit 10 generates control signals for and feeds them to the piston-cylinder means as a function of the measuring data. As a function of the measuring data, the solenoid generates a defined magnetic field causing a specific change in viscosity of the magneto-rheological liquid in cylinder 7. By changing the viscosity, the depth of penetration of piston 8 into cylinder 7 and thus the damping can be controlled accordingly. The change in damping occurs within about 3 to 5 milliseconds. This is of particular advantage when using the damping as a fall back brake. When the person wearing the prosthesis stumbles, the damping thus immediately built up can prevent at an early time the lower leg portion from being folded together.
The control unit, the sensors and the damping element are connected to each other in a feed back control circuit, as described, i.e. the damping is set during the walking by readjusting the control parameters P for setting the damping based on given values for the control parameters P. Compared to a traditional prosthesis control, this provides the advantage that the setting of the prosthesis functions is effected directly as a function of the natural gait performance of the person wearing the prosthesis.
In particular, the described leg prosthesis using the described algorithm has the advantage that the prosthesis is not controlled by selecting a defined gait performance out of a multitude of previously determined gait performances for a person wearing the prosthesis, but that a readjustment of the predetermined values for a defined gait performance is carried out. Thus, the prosthesis flexibly adapts to the instantaneous gait performance and a nearly natural gait is possible. In addition, readjusting the control parameters for different velocities enables the prosthesis control to be adapted to modified circumstances such as a change in weight of the person wearing the prosthesis or the use of a different foot part or a different shoe.
Modified embodiments are conceivable. More or fewer sensors than the sensors described above may be provided.
Instead of a piston-cylinder means having a piston that can be axially displaced within the cylinder, a piston-cylinder means having a rotating piston may also be used, which piston may be equipped with blades exposed to a specific resistance in the cylinder as a function of the viscosity of the magneto-rheological liquid. In this case, the piston rod is connected to a rotating shaft of the knee joint.
Nevertheless, the invention is not limited to a leg prosthesis having a hydraulic cylinder with a magneto-rheological liquid as the damping element. Rather, regular hydraulic cylinders may be used as well, where the damping can be adjusted using a bypass valve between the chambers. In this case, the valve opening may be controlled by stepping motors.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US5383939 *||Dec 5, 1991||Jan 24, 1995||James; Kelvin B.||System for controlling artificial knee joint action in an above knee prosthesis|
|US5888212 *||Jun 26, 1997||Mar 30, 1999||Mauch, Inc.||Computer controlled hydraulic resistance device for a prosthesis and other apparatus|
|DE3909672C2||Mar 23, 1989||Feb 4, 1993||Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd.), Kobe, Jp||Title not available|
|DE19521464A1||Jun 13, 1995||Mar 20, 1997||Bock Orthopaed Ind||Verfahren zur Steuerung der Kniebremse eines Prothesen-Kniegelenkes sowie Oberschenkelprothese|
|DE19754690A1||Dec 10, 1997||Jul 1, 1999||Biedermann Motech Gmbh||Beinprothese mit einem künstlichen Kniegelenk mit einer Regeleinrichtung|
|DE69209476T2||Sep 12, 1992||Jan 2, 1997||Bock Orthopaed Ind||Einrichtung zum Steuern der Bewegung eines künstlichen Kniegelenks einer Oberschenkelprothese|
|EP0549855A2||Sep 12, 1992||Jul 7, 1993||Otto Bock Orthopädische Industrie Besitz- und Verwaltungs-Kommanditgesellschaft||System for controlling artificial knee joint action in an above knee prosthesis|
|EP0628296A2||May 27, 1994||Dec 14, 1994||CHAS. A. BLATCHFORD & SONS LIMITED||Prosthesis control system|
|FR2623086A1||Title not available|
|GB1191633A||Title not available|
|WO1998022727A1 *||Nov 18, 1997||May 28, 1998||Advanced Fluid Systems Limited||Flow-control valve and damper|
|WO1999044547A1||Mar 3, 1999||Sep 10, 1999||Chas. A. Blatchford & Sons Limited||Lower limb prosthesis and control unit|
|1||Arai, K.I., et al., "Iron Loss of Tertiary Recrystallized Silicon Steel (Invited)", IEEE Transactions on Magnetics, pp. 3949-3954 (1989).|
|2||H. Dietl, et al.; "Der Einsatz von Elektronik bei Prothesen zur Versorgung der unteren Extremitat"; Med. Orth. Tech.; 117 (1997) pp. 31-35.|
|3||R. Kaitan; "Die Verwendung von Mikrocontrollern in der Prothetik"; Med. Orth. Tech. 117 (1997) pp. 26-30.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US6986290 *||Mar 22, 2004||Jan 17, 2006||Japan Automobile Research Institute||Leg shocking device for pedestrian protection test|
|US7213372 *||Nov 19, 2004||May 8, 2007||Multimatic Inc.||Method for controlling the speed of closing of a movable element|
|US7279009||Aug 22, 2003||Oct 9, 2007||Massachusetts Institute Of Technology||Speed-adaptive and patient-adaptive prosthetic knee|
|US7485152||Aug 26, 2005||Feb 3, 2009||The Ohio Willow Wood Company||Prosthetic leg having electronically controlled prosthetic knee with regenerative braking feature|
|US7597017 *||Jul 20, 2007||Oct 6, 2009||Victhom Human Bionics, Inc.||Human locomotion simulator|
|US7652386 *||Apr 30, 2008||Jan 26, 2010||Bionic Power Inc.||Method and apparatus for harvesting biomechanical energy|
|US7655050||Jul 28, 2006||Feb 2, 2010||Freedom Innovations, Llc||Computer controlled prosthetic knee device|
|US7659636||Apr 30, 2008||Feb 9, 2010||Bionic Power Inc.||Methods and apparatus for harvesting biomechanical energy|
|US7691154||May 6, 2005||Apr 6, 2010||össur hf||Systems and methods of controlling pressure within a prosthetic knee|
|US7799091||Oct 8, 2007||Sep 21, 2010||Massachusetts Institute Of Technology||Control system for prosthetic knee|
|US7811333||Dec 22, 2005||Oct 12, 2010||Ossur Hf||Systems and methods for processing limb motion|
|US7811334||Feb 11, 2005||Oct 12, 2010||Ossur Hf.||System and method for motion-controlled foot unit|
|US7896927||Mar 1, 2006||Mar 1, 2011||össur hf.||Systems and methods for actuating a prosthetic ankle based on a relaxed position|
|US7935152 *||May 10, 2006||May 3, 2011||S & S Sarl||Hinged connecting apparatus for a lower limb prosthesis|
|US8048007||Feb 2, 2006||Nov 1, 2011||össur hf||Prosthetic and orthotic systems usable for rehabilitation|
|US8048172||Sep 1, 2005||Nov 1, 2011||össur hf||Actuator assembly for prosthetic or orthotic joint|
|US8057550||Mar 23, 2009||Nov 15, 2011||össur hf.||Transfemoral prosthetic systems and methods for operating the same|
|US8122772||Dec 29, 2010||Feb 28, 2012||össur hf||Sensing systems and methods for monitoring gait dynamics|
|US8126736||Jan 23, 2009||Feb 28, 2012||Warsaw Orthopedic, Inc.||Methods and systems for diagnosing, treating, or tracking spinal disorders|
|US8128699||Mar 13, 2009||Mar 6, 2012||Warsaw Orthopedic, Inc.||Spinal implant and methods of implantation and treatment|
|US8211042||Jan 7, 2008||Jul 3, 2012||Victom Human Bionics Inc.||High torque active mechanism for orthotic and/or prosthetic devices|
|US8231687||Nov 29, 2005||Jul 31, 2012||Victhom Human Bionics, Inc.||Actuated leg prosthesis for above-knee amputees|
|US8231688||Jun 16, 2009||Jul 31, 2012||Berkeley Bionics||Semi-actuated transfemoral prosthetic knee|
|US8251928 *||Oct 10, 2006||Aug 28, 2012||Otto Bock Healthcare Gmbh||Method for carrying out a functional analysis of an artificial extremity|
|US8299634||Aug 10, 2006||Oct 30, 2012||Bionic Power Inc.||Methods and apparatus for harvesting biomechanical energy|
|US8323354||Mar 30, 2012||Dec 4, 2012||Victhom Human Bionics Inc.||Instrumented prosthetic foot|
|US8403997||Mar 20, 2007||Mar 26, 2013||Blatchford Products Limited||Lower limb prosthesis and control unit|
|US8435309||Jan 7, 2008||May 7, 2013||Victhom Human Bionics||Joint actuation mechanism for a prosthetic and/or orthotic device having a compliant transmission|
|US8444704||Feb 1, 2010||May 21, 2013||Freedom Innovations, Llc||Enhanced methods for mimicking human gait with prosthetic knee devices|
|US8487456||Oct 10, 2012||Jul 16, 2013||Bionic Power Inc.||Methods and apparatus for harvesting biomechanical energy|
|US8608678||May 19, 2009||Dec 17, 2013||Otto Bock Healthcare Gmbh||Orthopedic technical device|
|US8617254 *||Jan 22, 2010||Dec 31, 2013||Ossur Hf||Control system and method for a prosthetic knee|
|US8657886||Jun 16, 2011||Feb 25, 2014||össur hf||Systems and methods for actuating a prosthetic ankle|
|US8685093||Jan 23, 2009||Apr 1, 2014||Warsaw Orthopedic, Inc.||Methods and systems for diagnosing, treating, or tracking spinal disorders|
|US8702811||Apr 19, 2012||Apr 22, 2014||össur hf||System and method for determining terrain transitions|
|US8709097||Oct 31, 2011||Apr 29, 2014||össur hf||Actuator assembly for prosthetic or orthotic joint|
|US8717041 *||Jan 27, 2011||May 6, 2014||Freedom Innovations, L.L.C.||Angle measurement device and method|
|US8736087||Sep 1, 2011||May 27, 2014||Bionic Power Inc.||Methods and apparatus for control of biomechanical energy harvesting|
|US8801802||Feb 15, 2006||Aug 12, 2014||össur hf||System and method for data communication with a mechatronic device|
|US8814948||Feb 5, 2009||Aug 26, 2014||Otto Bock Healthcare Gmbh||Method for controlling an orthopedic knee joint|
|US8814949||Apr 18, 2006||Aug 26, 2014||össur hf||Combined active and passive leg prosthesis system and a method for performing a movement with such a system|
|US8852292||Aug 30, 2006||Oct 7, 2014||Ossur Hf||System and method for determining terrain transitions|
|US8858648||Sep 23, 2011||Oct 14, 2014||össur hf||Rehabilitation using a prosthetic device|
|US8869626||Feb 24, 2012||Oct 28, 2014||össur hf||Sensing systems and methods for monitoring gait dynamics|
|US8876912||Nov 12, 2010||Nov 4, 2014||Otto Bock Healthcare Products Gmbh||Method and device for controlling an artificial orthotic or prosthetic joint|
|US8915968||Sep 29, 2011||Dec 23, 2014||össur hf||Prosthetic and orthotic devices and methods and systems for controlling the same|
|US8986397||Jan 19, 2012||Mar 24, 2015||Victhom Human Bionics, Inc.||Instrumented prosthetic foot|
|US9017418||May 4, 2010||Apr 28, 2015||össur hf||Control systems and methods for prosthetic or orthotic devices|
|US9017419||Mar 8, 2013||Apr 28, 2015||össur hf||Linear actuator|
|US9028557||Mar 14, 2013||May 12, 2015||Freedom Innovations, Llc||Prosthetic with voice coil valve|
|US9044346||Mar 15, 2013||Jun 2, 2015||össur hf||Powered prosthetic hip joint|
|US9057361||Jun 27, 2013||Jun 16, 2015||Bionic Power Inc.||Methods and apparatus for harvesting biomechanical energy|
|US9060884||May 3, 2011||Jun 23, 2015||Victhom Human Bionics Inc.||Impedance simulating motion controller for orthotic and prosthetic applications|
|US9066817||Jun 1, 2012||Jun 30, 2015||Victhom Human Bionics Inc.||High torque active mechanism for orthotic and/or prosthetic devices|
|US9066819||Mar 18, 2013||Jun 30, 2015||össur hf||Combined active and passive leg prosthesis system and a method for performing a movement with such a system|
|US9078774||Aug 12, 2010||Jul 14, 2015||össur hf||Systems and methods for processing limb motion|
|US9089443||Mar 9, 2012||Jul 28, 2015||Nabtesco Corporation||Multi-articulated link knee joint|
|US9161847||May 19, 2009||Oct 20, 2015||Otto Bock Healthcare Products Gmbh||Orthopedic device comprising a joint|
|US9222468||Apr 30, 2014||Dec 29, 2015||Bionic Power Inc.||Methods and apparatus for control of biomechanical energy harvesting|
|US9271850||Nov 12, 2010||Mar 1, 2016||Otto Bock Healthcare Products Gmbh||Method and device for controlling an artificial orthotic or prosthetic joint|
|US9271851||Feb 28, 2011||Mar 1, 2016||össur hf.||Systems and methods for actuating a prosthetic ankle|
|US9345591||Nov 15, 2013||May 24, 2016||össur hf||Control system and method for a prosthetic knee|
|US9351854||Apr 28, 2014||May 31, 2016||össur hf||Actuator assembly for prosthetic or orthotic joint|
|US9351855||May 24, 2012||May 31, 2016||Ekso Bionics, Inc.||Powered lower extremity orthotic and method of operation|
|US9358137||Jun 14, 2010||Jun 7, 2016||Victhom Laboratory Inc.||Actuated prosthesis for amputees|
|US9387096||Jun 16, 2010||Jul 12, 2016||Ossur Hf||Feedback control systems and methods for prosthetic or orthotic devices|
|US9462966||Oct 23, 2014||Oct 11, 2016||össur hf||Sensing systems and methods for monitoring gait dynamics|
|US20040039454 *||Aug 22, 2003||Feb 26, 2004||Herr Hugh M.||Speed-adaptive and patient-adaptive prosthetic knee|
|US20040187601 *||Mar 22, 2004||Sep 30, 2004||Atsuhiro Konosu||Leg shocking device for pedestrian protection test|
|US20050097822 *||Nov 19, 2004||May 12, 2005||Multimatic, Inc.||Method for controlling the speed of closing of a movable element|
|US20050192677 *||Feb 11, 2005||Sep 1, 2005||Ragnarsdottir Heidrun G.||System and method for motion-controlled foot unit|
|US20050197717 *||Feb 11, 2005||Sep 8, 2005||Ragnarsdottir Heidrun G.||System and method for motion-controlled foot unit|
|US20050283257 *||Mar 9, 2005||Dec 22, 2005||Bisbee Charles R Iii||Control system and method for a prosthetic knee|
|US20060074493 *||May 6, 2005||Apr 6, 2006||Bisbee Charles R Iii||Systems and methods of loading fluid in a prosthetic knee|
|US20060122711 *||Nov 29, 2005||Jun 8, 2006||Stephane Bedard||Actuated leg prosthesis for above-knee amputees|
|US20060135883 *||Dec 22, 2005||Jun 22, 2006||Jonsson Helgi||Systems and methods for processing limb motion|
|US20060173552 *||Feb 2, 2006||Aug 3, 2006||Roy Kim D||Prosthetic and orthotic systems usable for rehabilitation|
|US20060224246 *||Mar 1, 2006||Oct 5, 2006||Clausen Arinbjorn V||Systems and methods for adjusting the angle of a prosthetic ankle based on a measured surface angle|
|US20060224247 *||Mar 1, 2006||Oct 5, 2006||Clausen Arinbjorn V||Systems and methods for actuating a prosthetic ankle based on a relaxed position|
|US20070050044 *||Aug 26, 2005||Mar 1, 2007||The Ohio Willow Wood Company||Prosthetic leg having electronically controlled prosthetic knee with regenerative braking feature|
|US20070050045 *||Sep 1, 2005||Mar 1, 2007||Clausen Arinbjorn V||Sensing system and method for motion-controlled foot unit|
|US20070156252 *||Sep 1, 2005||Jul 5, 2007||Ossur Hf||Actuator assebmly for prosthetic or orthotic joint|
|US20080021570 *||Jul 20, 2007||Jan 24, 2008||Stephane Bedard||Human locomotion simulator|
|US20080277943 *||Apr 30, 2008||Nov 13, 2008||Donelan James M||Method and apparatus for harvesting biomechanical energy|
|US20080287834 *||Oct 10, 2006||Nov 20, 2008||Otto Bock Healthcare Ip Gmbh & Co. Kg||Method for Carrying Out a Functional Analysis of an Artificial Extremity|
|US20090030530 *||Aug 5, 2008||Jan 29, 2009||Martin James J||Electronically controlled prosthetic system|
|US20090054996 *||Mar 20, 2007||Feb 26, 2009||Andrew John Sykes||Lower Limb Prosthesis and Control Unit|
|US20090187260 *||May 10, 2006||Jul 23, 2009||S & S Sarl||Hinged connecting apparatus for a lower limb prosthesis|
|US20090222105 *||Mar 23, 2009||Sep 3, 2009||Ossur Hf.||Transfemoral prosthetic systems and methods for operating the same|
|US20090234456 *||Mar 14, 2008||Sep 17, 2009||Warsaw Orthopedic, Inc.||Intervertebral Implant and Methods of Implantation and Treatment|
|US20090267030 *||Nov 13, 2006||Oct 29, 2009||Shigekazu Tomai||Sintered body for vacuum vapor deposition|
|US20090299480 *||Jan 7, 2008||Dec 3, 2009||Victhom Human Bionics Inc.||Joint Actuation Mechanism for a Prosthetic and/or Orthotic Device Having a Compliant Transmission|
|US20100023133 *||Jun 16, 2009||Jan 28, 2010||Berkeley Bionics||Semi-actuated transfemoral prosthetic knee|
|US20100138000 *||Feb 1, 2010||Jun 3, 2010||Palmer Michael L||Novel enhanced methods for mimicking human gait with prosthetic knee devices|
|US20100160844 *||Jan 7, 2008||Jun 24, 2010||Benoit Gilbert||High Torque Active Mechanism for Orthotic and/or Prosthetic Devices|
|US20100185124 *||Jan 22, 2010||Jul 22, 2010||Ossur Engineering, Inc.||Control system and method for a prosthetic knee|
|US20100234954 *||Mar 13, 2009||Sep 16, 2010||Warsaw Orthopedic, Inc.||Spinal implant and methods of implantation and treatment|
|US20100276944 *||Aug 10, 2006||Nov 4, 2010||Simon Fraser University||Methods and apparatus for harvesting biomechanical energy|
|US20100286796 *||May 4, 2010||Nov 11, 2010||Ossur Hf||Control systems and methods for prosthetic or orthotic devices|
|US20100305716 *||Nov 5, 2008||Dec 2, 2010||Otto Bock Healthcare Gmbh||Method for controlling an orthopedic joint|
|US20100324698 *||Jun 16, 2010||Dec 23, 2010||Ossur Hf||Feedback control systems and methods for prosthetic or orthotic devices|
|US20110087339 *||Feb 5, 2009||Apr 14, 2011||Otto Bock Healthcare Gmbh||Orthopedic knee joint and method for controlling an orthopedic knee joint|
|US20110098606 *||Dec 29, 2010||Apr 28, 2011||Ossur Hf||Sensing systems and methods for monitoring gait dynamics|
|US20110130846 *||May 19, 2009||Jun 2, 2011||Otto Bock Healthcare Products Gmbh||Orthopedic device comprising a joint and method for controlling said orthopedic device|
|US20110130847 *||Aug 26, 2010||Jun 2, 2011||Victhom Human Bionics Inc.||Instrumented prosthetic foot|
|US20110137212 *||May 19, 2009||Jun 9, 2011||Otto Bock Healthcare Gmbh||Orthopedic technical device|
|US20110199101 *||Jan 27, 2011||Aug 18, 2011||Steele Wilson F||Angle measurement device and method|
|US20120191017 *||Jan 5, 2012||Jul 26, 2012||Board Of Governors For Higher Education, State Of Rhode Island And Providence Plantations||Stumble detection systems and methods for powered artificial legs|
|US20120226364 *||Nov 12, 2010||Sep 6, 2012||Otto Bock Healthcare Products Gmbh||Method for controlling an orthotic or prosthetic joint of a lower extremity|
|USRE42903||Jul 20, 2006||Nov 8, 2011||Massachusetts Institute Of Technology||Electronically controlled prosthetic knee|
|CN100528107C||Nov 6, 2006||Aug 19, 2009||上海理工大学||Intelligent lap artificial limb system controlled to follow pace of health leg|
|DE102009030995A1||Jun 30, 2009||Jan 5, 2011||Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.||Aktive Prothesenvorrichtung mit Terrainerfassung und Verfahren zum Steuern einer aktiven Prothesenvorrichtung|
|EP2331026A1 *||Jun 16, 2009||Jun 15, 2011||Berkeley Bionics||Semi-actuated transfemoral prosthetic knee|
|EP2340789A1 *||Feb 1, 2006||Jul 6, 2011||Ossur HF||Methods and systems for gathering information regarding a prosthetic foot|
|EP2762108A1||Jul 28, 2006||Aug 6, 2014||Freedom Innovations, LLC||Computer controlled prosthetic knee device|
|WO2006069264A1 *||Dec 21, 2005||Jun 29, 2006||össur hf||Systems and methods for processing limb motion|
|WO2008086629A1 *||Jan 21, 2008||Jul 24, 2008||Victhom Human Bionics Inc.||Reactive layer control system for prosthetic and orthotic devices|
|WO2011000542A1||Jun 28, 2010||Jan 6, 2011||Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.||Active prosthesis device with terrain detection, and method for controlling an active prosthesis device|
|WO2011096965A2 *||Oct 29, 2010||Aug 11, 2011||Vanderbilt University||Systems and control methodologies for improving stability in powered lower limb devices|
|WO2011096965A3 *||Oct 29, 2010||Dec 22, 2011||Vanderbilt University||Systems and control methodologies for improving stability in powered lower limb devices|
|WO2013188510A2 *||Jun 12, 2013||Dec 19, 2013||Iwalk, Inc.||Prosthetic, orthotic or exoskeleton device|
|WO2013188510A3 *||Jun 12, 2013||Apr 10, 2014||Iwalk, Inc.||Prosthetic, orthotic or exoskeleton device|
|WO2016169855A1 *||Apr 15, 2016||Oct 27, 2016||Otto Bock Healthcare Products Gmbh||Method for controlling an artificial knee joint|
|International Classification||A61F2/66, A61F2/80, A61F2/70, A61F2/74, A61F2/64, A61F2/68, A61F2/50, A61F2/60, A61F2/76|
|Cooperative Classification||A61F2002/6863, A61F2002/6614, A61F2002/7635, A61F2/64, A61F2002/5004, A61F2002/607, A61F2/68, A61F2/80, A61F2002/745, A61F2002/5003, A61F2002/704|
|Aug 21, 2000||AS||Assignment|
Owner name: BIEDERMANN MOTECH GMBH, GERMANY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BIEDERMANN, LUTZ;MATTHIS, WILFRIED;SCHULZ, CHRISTIAN;REEL/FRAME:011067/0609;SIGNING DATES FROM 20000726 TO 20000727
|Sep 7, 2004||CC||Certificate of correction|
|Dec 17, 2007||FPAY||Fee payment|
Year of fee payment: 4
|Jun 9, 2008||AS||Assignment|
Owner name: OTTO BOCK HEALTHCARE IP GMBH & CO. KG, GERMANY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BIEDERMANN MOTECH GMBH;REEL/FRAME:021064/0504
Effective date: 20071119
|Dec 22, 2011||FPAY||Fee payment|
Year of fee payment: 8
|Dec 22, 2015||FPAY||Fee payment|
Year of fee payment: 12